W. WEST AND G. S. WEST : ALGA-FLORA OF YORKSHIRE. 2 1 



Var. bicolor (Eng. Bet. ) Nob. [Syn. Conferva bicolor Eng. 



Bot, 1790 — 1814; Hormiscia spea'osa (C3.nn., 1833) 



Rabenh., 1868 ; JI. zonata var. valida (Nag., 1849) 



Rabenh., i868]. 



More or less abundant in mountain streams, more especially 



in the earlier months of the year. 



S.W. — Crimsworth Dean. Holden Ghyll, near Keighley. 

 Mm W. — Leathley. Linn Ghyll. Crook Ghyll near Buckden. 

 N.W. — Near Sedbergh. Near the 'Moorcock Inn'. Cotterdale. 

 Abundant in the River Ure (iii. 1889). 



Genus RHAPHIDONEMA Lagerh., 1892. 



61. Rhaphidonema nivale Lagerh. 

 Mid W. — Langclifife, near Settle (viii., 1896). 



Thickness of filaments, 2-5 — 3-5 /x; total length of filaments, 

 94— 123 /i. 



Not previously recorded for the British Isles, 



Genus HORMOSPORA Breb., 1840. 



62. Hormospora ordinata West & G. S. West. 

 Mid W.— Cam Fell. 



The small size of the cells, their remoteness and comparative 

 shortness sufficiently differentiate this species. The cell-contents 

 are bright green and very granulose. 



63. Hormospora dubia Schmidle. 



S.W. — In horse trough, Allerton, near Bradford (vi., 1898). 



This species has not previously been recorded for the British 



Isles. 



Genus GLCEOTILA Kutz., 1843. 



64. Glceotila protogenita Kiitz. 

 N.E. — Pilmoor, near Thirsk. 

 Previously unrecorded for the British Isles. 



Genus GEMINELLA Turp., 1828. 



65. Geminella interrupta Turp., 1828; em. Lagerh., 



1883. 

 N.E. — Pilmoor, near Thirsk. 



Bot. s— B 



